... ,pump,thermal exchange,auto vent-pipe, hole of flange and etc Spiral wound gasket:static sealing element of pipe, valve,pump,thermal ... exchange,auto vent-pipe, hole of flange and etc 1 ... steel nontal ring include graphite strip, ceramic strip, asbestos strip, teflon strip.5): size: 1/2"-48"6): ASTM, DIN Spiral ...